Authentic and traditional flour tortillas are made with shortening or lard; nowadays, you find recipes with butter or oil, heavy cream, or milk. Every home or region makes flour tortillas different. Don’t worry if you can’t make a round tortilla, make them the shape you can; that won’t change the delicious flavor. Testales (the flat thick circles ready to be rolled up into a tortilla) and ready-to-cook tortillas can be stored in the fridge for up to 7 days in a plastic bag.